That is the reality: everyone goes looking for gold, but—there is always a "but"—there is no single "right" answer when it comes to profitability. Under U.S. law, if a treasure is found on private land without the owner's consent, it belongs entirely to the landowner. If you declare the find to the government, taxes can take up to 50–60% (as personal income), yet concealing the treasure carries the risk of imprisonment.
Few people realize that this gold was meant for soldiers' pay; 3 tons of gold amounts to 357,995 coins (the weight of one gold guinea is 8.38 grams, of which 7.68 grams is pure gold)—worth roughly $240 million. For context, soldiers were supposed to be paid five coins each... there's no point going into further detail; it’s a long story. Back then, you understand, anyone with a letter like that wouldn't have lived long enough to face trial—and even today, if you found it, they’d quickly take it away from you.